toi change them, the best bet will be to drop the windows as far down as possible and try slip your hand into the gaps and lever them out. The likelhood is that they are clipped in place, so you need to be firm but gentle.

I was toying with the idea of changing mine Fezzer but it looks like a load of hassle. I would suggest using plasidip rubberised paint on them instead, at leased if you don't like it / !Removed! it up you can remove the paint by pealing it off.